Table 1. Patient population.
| Characteristics | Number of patients (%) |
|---|---|
| Age, years | median 60 (range, 29–81) |
| Histologic classification | |
| Minimally invasive adenocarcinoma | 2 (1.0) |
| Invasive adenocarcinoma | |
| Lepidic predominant | 9 (4.5) |
| Acinar predominant | 142 (71.7) |
| Papillary predominant | 18 (9.1) |
| Micropapillary predominant | 1 (0.5) |
| Solid predominant | 17 (8.6) |
| Mucinous adenocarcinoma | 9 (4.5) |
| T stage | |
| 1 | 104 (52.5) |
| 2 | 83 (41.9) |
| 3 | 11 (5.6) |
| N stage1 | |
| 0 | 124 (65.6) |
| 1 | 25 (13.2) |
| 2 | 40 (21.2) |
| M stage | |
| 0 | 196 (99.0) |
| 1 | 2 (1.0) |
| Operation | |
| Wedge resection | 16 (8.0) |
| Lobectomy | 169 (85.3) |
| Lobectomy + α2 | 13 (6.6) |
| Neoadjuvant CCRT3 | |
| Yes | 11 (5.6) |
| No | 187 (94.4) |
1
Nine cases were excluded because lymph node dissection was not performed.
2
α includes lobectomy with wedge resection of the other lobe, bilobectomy, or pneumonectomy.
3
CCRT indicates concurrent chemoradiation therapy.